Details

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BUY UC3843BD1013TR https://www.utsource.net/itm/p/12536164.html

Parameter	Description	Min	Typ	Max	Unit
Supply Voltage (Vcc)	Operating supply voltage range	8.0	-	40.0	V
Start-Up Current	Maximum start-up current	-	1.0	-	mA
Quiescent Current	Operating quiescent current	2.5	3.5	4.5	mA
Oscillator Frequency	Frequency range of the oscillator	1.0	-	500.0	kHz
Reference Voltage	Internal reference voltage	4.98	5.0	5.02	V
Error Amplifier Gain	Open-loop gain of the error amplifier	-	100	-	dB
Error Amplifier Bandwidth	Bandwidth of the error amplifier	-	1.5	-	MHz
PWM Comparator Input Voltage	Maximum input voltage for the PWM comparator	-	5.0	-	V
Minimum Off Time	Minimum off time for the PWM	1.0	-	-	μs
Maximum Duty Cycle	Maximum duty cycle for the PWM	-	97	-	%
Thermal Shutdown Temperature	Temperature at which thermal shutdown occurs	-	160	-	°C
Storage Temperature	Range of storage temperatures	-40	-	125	°C
Operating Temperature	Range of operating temperatures	-40	-	125	°C

Instructions for UC3843BD1013TR

1. Power Supply Connection:

   • Connect the Vcc pin to a power supply within the range of 8.0V to 40.0V.
   • Ensure a stable power supply to avoid fluctuations that can affect performance.

2. Start-Up Circuit:

   • Use a resistor and capacitor on the Vcc pin to control the start-up time and current.
   • The start-up current should not exceed 1.0mA.

3. Oscillator Configuration:

   • Set the oscillator frequency using an external resistor and capacitor connected to the RT/CT pin.
   • The frequency range is from 1.0kHz to 500.0kHz.

4. Error Amplifier:

   • Connect the inverting and non-inverting inputs of the error amplifier to the appropriate feedback and reference voltages.
   • The open-loop gain of the error amplifier is 100dB, and the bandwidth is 1.5MHz.

5. PWM Control:

   • The PWM comparator input voltage should be kept below 5.0V.
   • Set the minimum off time to at least 1.0μs to ensure proper operation.
   • The maximum duty cycle is 97%.

6. Thermal Management:

   • Monitor the device temperature to prevent it from exceeding 160°C, which triggers thermal shutdown.
   • Ensure adequate heat dissipation and cooling if operating in high-temperature environments.

7. Temperature Ranges:

   • Store the device between -40°C and 125°C.
   • Operate the device within the same temperature range to maintain reliability.

8. Layout Considerations:

   • Keep the layout compact to minimize noise and interference.
   • Use bypass capacitors close to the Vcc pin to filter out any noise.

9. Testing and Troubleshooting:

   • Verify the supply voltage and current during initial testing.
   • Check the oscillator frequency and PWM signals using an oscilloscope.
   • Ensure all connections are secure and free from shorts or open circuits.

(For reference only)